Shaking and dumping grate



Dec. 9 4. 1,520,239

' A. D. HAMLIN SHAKING AND DUIIPING GH'ATE Original Filed Doc. 2 1905 2Sheets-Sheet '1 Wa l wow:

A. D. HAMLIN SHAKING AND punt-rue GRATE 2 Sheets-Shedtz Original FiledDa c- 29. 1905 M Mae WM 12% i cgawuflww "M g a- Witmeoaw ymzfi/ MyPatented Dec. 23, 1924..

UNITED STATES.

PATENT OFFICE.

ARTHUR D. HAMLIN, DECEASED, LA'IEOF DORTLAND, MAINE; BY MINNIE M. HAM-LIN, ADMINISTRATBIX, OF PORTLAND, MAINE.

SHAKING AND DUMPING GRATE,

Refiled for abandoned application Serial No. 293,806Qfi1ed December 29,1905.

September 11, 1924. Serial No. 737,443.

To all whom it may concern:

Be it known that ARTHUR D. HAMLIN, late a citizen of the United States,deceased, residing at Portland, in the county of Cumberland and State ofMaine, did invent new and useful Improvements in Shaking and DumpingGrates, of which the following is a specification.

This invention relates to an improve ment in shaking and dumping gratesand more particularly to grates of this character employing rockingbars.

The object of this invention is the provision of a grate of thischaracter in which the rocking bars are so formed and assembled thatcoals and clinkers will be prevented from accumulating between the endsthereof during the shaking movementthereof and thereby clogging thegrate.

A further object of the invention is the provision in a grate of thischaracter of means for maintaining the air space dur ing the shakingmovement of the grate as when in its normal position.

A still further object of the invention is the provision of improvedmeans for rocking the grate bars, whereby they may be rocked further ontheir axes than has heretofore been practical, to completely efiect thedun'iping of the fire.

Other objects of the invention will be apparent from the detaileddescription hereinafter, when readin connection with the accompanyingdrawings, wherein a preferable embodiment of my invention is shown andwherein like numerals of reference refer to similar parts in the severalviews.

In the drawings,

Figure 1 is a fragmentary perspective view of a furnace clip with myimproved grate,

Fig. 2 is a transverse section through the grate frame.

Fig. 3 is a cross-section showing several of the grate bars in theirshaking position,

Fig. 4 is a longitudinal section showing the grate bars in their normalposition, and

Fig. 5 is a longitudinal section, with parts in elevation, showing thegrates in their dumping position.

Referring now more particularly to the drawings, A designates the frameof my improved grate, which is preferably rec- This application filedtangular in form and comprises the end pieces B and the side pieces C,which are adapted to be supported-in any suitable manner within thefurnace. Theend pieces B of the grate frame are provided with theinwardly extending spaced arms or teeth 6, for a purpose to behereinafter set forth. The side pieces, C are provided with the inwardlyextending lugs 0,'which have their upper surfaces curvedto formthepivotal supports for the rocking barsD. The rocking bars D each.comprises. acentral por tion (5, in the ends of which are formed the Ibar will extend into and substantially fill the space between two of theteeth of the next adjacent bar, the outer rows of teeth on the end gratebars extending into the spaces between the arms or teeth I) projectingfrom the end pieces B of the grate frame. lVhen the grate bars D are intheir assembled position, the ends of the teeth 03, of each bar extendinto proximity to the central portion at of the next adjacent bar. Theends of said teeth are curved substantially on the arc of a circle, thecenter of which is the pivotal point of the rocking bars, as at 03 sothat they will maintain the same relative position with reference tosaid central portion cl during a portion of their rocking movement. Inother words, the distance between the ends of the teeth (5 and thecentral portion d of the adj acent rocking bar will remain constantuntil the rocking bar is moved a suflicient amount to permit the ends ofthe teeth to completely clear said central portion. Each of the gratebars D has projecting downwardly from the central portion 01 thereof,

an arm (Z which is provided at its free end with a bifurcated portion dThe arm 0Z of each grate bar is positioned directly in rear of one ofthe teeth cl thereof and is of such a thickness that when the grate baris moved to its dumping position, the said arm may move up into thespace formerly occupied by said tooth between two ofthe teeth of thenext adjacent bar. E designates a rod which extends transversely of thegrate bars D and is provided with a plurality of upwardly extending arms6, which extend into the bifurcated portions d of the depending arms 01of the grate bars and are pivotally secured therein in any suitablemanner. The forward end of the rod E is pivotally connected by a link F,which projects through the front of the furnace, to the lower end of anactuating leverG which is pivotally secured to a bracket H attached tothe front of the furnace.

The end pieces B of the grate frame and the central portion d oftherocking bars D are provided with air apertures extending therethrough.

Having described the construction'of my improved grate, I will now setforth the manner of using the same.

When it is desired to shake the fire, the operating lever G is moved torock the grate bars D to a limited extent only, so that the ends of theteeth d thereof will not clear the central portion d of the nextadjacent bar, and as the ends of said teeth are curved so that the samedistance will always he maintained between the endsthereof and thecentral'portion (Z of thenex t bar, it will be seen that no clinkers canaccumulate between the ends of the teeth and the central portions (l andthereby interfere with the rocking movement of the bars. Furthermore, asthe ends of the teeth always remain the same distance from the centralportion of the next adjacent bar during the shaking movement of thebars, it will be apparent that the same air space will be maintainedduring the shaking movement of the grate as when in its normal position.When it is desired to dump the fire, the actuating lever G is moved tocause the teeth of each grate'bar to clear the teeth of the nextadjacent grate bar. Owing to the positioning of the depending arms d andthe connection of the rod E therewith by means of upwardlyextending arms6, it will be apparent that the grate bars can be turned to a positionat substantially right angles to the grate frame to completely effeetthe dumping of the fire.

I do not desire to limit myself to the precise form and constructionshown in the drawings as it is obvious that many minor changes might bemade thereto without departing from the spirit of the invention.

What I desire to secure by Letters Patent is A grate of the characterdescribed comprising a frame, a plurality of toothed grate barsjournaled therein, the teeth of each of said bars being arranged tooccupy the space between the teeth of the next adjacent bar an armdepending from the central portion of each of said rocking bars. saidarm being positioned directly in rear of one of the teeth of said barand of less width than the space between adjoining teeth on thenextadjacent bar and being of a length to permit its entrance into saidspace and to clearthe adjacent bar when the bars are rocked, a barextending transversely of said grate bars and provided with a pluralityof upwardly extending arms direct-1y underlying and pivotally connectedto the free ends of the arms depending from said grate bars, and meansfor imparting a reciprocatory movement to said bars.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

MINNIE M. HAMLIN,

Admm. estate of fl'rthm" D. Hamlin, (Zeceased. Vitnesses MELVILLE H.MARsToN. HAROLD N. BURNHAM.

